WASHINGTON, Jan. 20 (UPI) -- United Airlines has become the latest U.S. air carrier to clamp down on its frequent flier program for passengers, it was reported Saturday.
United is following the path of Delta Airlines and U.S. Airways, which both recently scaled back their programs that provide free tickets to passengers as well, the Washington Post said.
Members of United's Mileage Plus program will either have to fly or use its special credit card at least once every 18 months to keep their flier miles active. The miles used to expire after three years, the Post said.
Spokeswoman Robin Urbanski said frequent flier miles "are considered liabilities" on the company's books.
Experts told the Post that U.S. airlines have been trying to become more profitable by putting more restrictions on programs that reward fliers with free tickets.
